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Finding the Fourth Proportional to 1,288,486.64, 1,932,978.98 and 489,705.90

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Solution

The fourth proportional to 1,288,486.64, 1,932,978.98 and 489,705.90 is: 734,653.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288,486.64 : 1,932,978.98 = 489,705.90 : x
  2. Step 2: Convert to fraction form
    1,288,486.64/1,932,978.98 = 489,705.90/x
  3. Step 3: Cross multiply
    1,288,486.64x = 1,932,978.98 × 489,705.90
  4. Step 4: Simplify right side
    1,288,486.64x = 946,591,211,081.98
  5. Step 5: Solve for x
    x = 946,591,211,081.98/1,288,486.64
  6. Step 6: Final answer
    x = 734,653.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.